function User() {}
const lisi = new User();
User.prototype = {
  show() {
    return "prototype show";
  }
};
const wangwu = new User();
console.log(wangwu.show());

console.log(lisi.show); // lisi.show is not a function

console.log(lisi.constructor)
console.log(wangwu.constructor)
